The present work is in a sense, an epitome of the thought of mankind on the destiny of man. I have striven to add value to it by comprehensiveness of plan, not confining myself, as most of my predecessors have confined themselves, to one province or a few narrow provinces of the subject, but including the entire subject in one volume; by carefulness of arrangement, not piling the material together or presenting it in a chaos of facts and dreams, but grouping it all in its proper relations; by clearness of explanation, not leaving the curious problems presented wholly in the dark with a mere statement of them, but as far as possible tracing the phenomena to their origin and unveiling their purport; by poetic life of treatment, not handling the different topics dryly and coldly, but infusing warmth and color into them; by copiousness of information, not leaving the reader to hunt up every thing for himself, but referring him to the best sources for the facts, reasonings, and hints which he may wish; and by persevering patience of toil, not hastily skimming here and there and hurrying the task off, but searching and researching in every available direction, examining and re examining each mooted point, by the devotion of twelve years of anxious labor. How far my efforts in these particulars have been successful is submitted to the public. To avoid the appearance of pedantry in the multiplication of foot notes, I have inserted many authorities incidentally in the text itself, and have omitted all except such as I thought would be desired by the reader. Every scholar knows how easy it is to increase the number of references almost indefinitely, and also how deceptive such an ostensible evidence of wide reading may be. When the printing of this volume was nearly completed, and I had in some instances made more references than may now seem needful, the thought occurred to me that a full list of the books published up to the present time on the subject of a future life, arranged according to their definite topics and in chronological order, would greatly enrich the work and could not fail often to be of vast service. Accordingly, upon solicitation, a valued friend Mr. Ezra Abbot, Jr., a gentleman remarkable for his varied and accurate scholarship undertook that laborious task for me; and he has accomplished it in the most admirable manner. No reader, however learned, but may find much important information in the bibliographical appendix which I am thus enabled to add to this volume. Every student who henceforth wishes to investigate any branch of the historical or philosophical doctrine of the immortality of the soul, or of a future life in general, may thank Mr. Abbot for an invaluable aid.